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David Ludwig Biography

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“Just as calories differ according to how they affect the body, so too do carbohydrates. All carbohydrates break down into sugar, but the rate at which this occurs in the digestive tract varies tremendously from food to food. This difference forms the basis for the glycemic index (GI). The GI ranks carbohydrate-containing foods according to how they affect blood glucose, from 0 (no affect at all) to 100 (equal to glucose). Gram for gram, most starchy foods raise blood glucose to very high levels and therefore have high GI values. In fact, highly processed grain products – like white bread, white rice, and prepared breakfast cereals – and the modern white potato digest so quickly that their GI ratings are even greater than table sugar (sucrose). So for breakfast, you could have a bowl of cornflakes with no added sugar, or a bowl of sugar with no added cornflakes. They would taste different but, below the neck, act more or less the same. A related concept is the glycemic load (GL), which accounts for the different carbohydrate content of foods typically consumed. Watermelon has a high GI, but relatively little carbohydrate in a standard serving, producing a moderate GL. In contrast, white potato has a high GI and lots of carbohydrate in a serving, producing a high GL. If this sounds a bit complicated, think of GI as describing how foods rank in a laboratory setting, whereas GL as applying more directly to a real-life setting. Research has shown that the GL reliably predicts, to within about 90 percent, how blood glucose will change after an actual meal – much better than simply counting carbohydrates as people with diabetes have been taught to do.”

“There’s also some indication that replacing carbohydrate with plant rather than animal foods has special health benefits. Among approximately eighty thousand women in the Nurses’ Health Study consuming lower-carbohydrate diets, high consumption of vegetable protein and fat was associated with a 30 percent lower risk for heart disease over twenty years, whereas high consumption of animal protein and fat appear to provide no such protection. One explanation for this finding is that the relative amounts of amino acids in animal protein stimulate more insulin and less glucagon release than those in plant protein – a hormone combination that has detrimental effects on serum cholesterol and fat-cell metabolism. Other possible downsides of a modern, animal-based diet include a less healthful profile of dietary fats, excessive iron absorption (especially for men), and chronic exposure to hormones, preservatives, and environmental pollutants.”